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公开(公告)号：JPH11288358A
公开(公告)日：1999-10-19
申请号：JP560999
申请日：1999-01-12
Applicant: IBM
Inventor： TREIBER RICHARD K , HASWELL JONATHAN M , NG SPENCER W , YAMAGUCHI MARIO
Abstract: PROBLEM TO BE SOLVED: To provide a computer disk drive system having a buffer to which a data preread/prefetch principle is selectively established by including a principle prefetch controller, etc., to receive the data from a user and to produce a prescribed signal as an answer to the data request. SOLUTION: A prefetch principle controller, etc., is prepared to receive the data from a user and to produce a prescribed signal as an answer to the data request. In this system, a disk drive controller 26 can selectively prefetch or interrupt the preread of data to a buffer 24. Thereby, a prefetch principle controller 32 instructs the prefetch of the preread of data to the buffer 24 when a request is received to obtain only the data that are stored in a disk 22. The controller 26 also includes a non-prefetch principle controller 34 which prevents the prefetch of the preread of data to the buffer 24 in the same situation where the prefetch should be originally permitted by the controller 32.
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公开(公告)号：CA2066154C
公开(公告)日：1996-01-02
申请号：CA2066154
申请日：1992-04-15
Applicant: IBM
Inventor： NG SPENCER W , PALMER DAVID W , THOMPSON RICHARD S
Abstract: Fault tolerance in a redundant array of disk drives is degraded when error conditions exist in the array. Several methods for rebuilding data of the array to remove the degradation are described. Data rebuilding for entire disk drives and partial data rebuilds of disk drives are described. All rebuild methods tend to reduce the negative affect of using array resources for the data rebuild. In one method rebuilding occurs during idle time of the array. In a second method rebuilding is interleaved between current data area accessing operations of the array at a rate which is inversely proportional to activity level of the array. In a third method, the data are rebuilt when a data area being accessed is a data area needing rebuilding.
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公开(公告)号：CA2066154A1
公开(公告)日：1992-12-19
申请号：CA2066154
申请日：1992-04-15
Applicant: IBM
Inventor： NG SPENCER W , PALMER DAVID W , THOMPSON RICHARD S
Abstract: Fault tolerance in a redundant array 13 of disk drives 20, 21, 22, 23, 24 is degraded when errors exist in the array. Data in the array is rebuilt to remove the degradation, either for entire disk drives or for partial data, with minimal impact on array resources. Rebuilding occurs during idle time of the array or is interleaved between current data area accessing operations of the array at a rate which is inversely proportional to the activity level of the array. Alternatively, data is rebuilt when a data area being accessed is in need of rebuilding.
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公开(公告)号：CA2063897A1
公开(公告)日：1992-12-14
申请号：CA2063897
申请日：1992-03-24
Applicant: IBM
Inventor： MENON JAISHANKAR M , MATTSON RICHARD L , NG SPENCER W
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